TLE7181EM need 20 seconds to set GH1 high

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liuhaidong202
Level 1
Level 1
First reply posted First question asked Welcome!

Hi, I am testing TLE7181EM with MC9S12G48.

when I set PWM pin to high level(5V, 100% duty cycle), TLE7181EM needs about 20 seconds to set GH1 or GH2 to high(16V). Setting GH1 or GH2 to low seems right.

Configuration is as below: ENA = true, DRVDIS = false, DIR = true or false, PWM is always true or false, then power up the Vs pin.

Can I conclude that it is caused by hardware?   can this be caused by dead time?(in the datasheet it seems that max dead time is 6 us)

What is the initialization sequence for power on of TLE7181EM?

 

thanks a lot!

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1 Solution
yananwang
Moderator
Moderator
Moderator
5 solutions authored 5 replies posted First question asked

Dear liuhaidong202,

here I see two issues in the application:

  • The maximum dutycycle of TLE7181 high side is 95%,defined in datasheet page 1:'0 … 95% at 20 kHz & 100% duty cycle of high-side MOSFETs'.  So, we suggest to define a 50% dutycycle for testing.
  • TLE7181 needs a special initial sequence, or wakeup sequence, please refer to datasheet4.1.8. If this sequence is  not correctly defined, the product can't be initialized and will not work

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2 Replies
RupakC
Moderator
Moderator
Moderator
100 solutions authored 250 sign-ins 25 likes received

Hi @liuhaidong202 

In case you are using a custom board, can you please send us your schematic such that we can find a solution to your problem ?

Thanks and Regards

RupakC
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yananwang
Moderator
Moderator
Moderator
5 solutions authored 5 replies posted First question asked

Dear liuhaidong202,

here I see two issues in the application:

  • The maximum dutycycle of TLE7181 high side is 95%,defined in datasheet page 1:'0 … 95% at 20 kHz & 100% duty cycle of high-side MOSFETs'.  So, we suggest to define a 50% dutycycle for testing.
  • TLE7181 needs a special initial sequence, or wakeup sequence, please refer to datasheet4.1.8. If this sequence is  not correctly defined, the product can't be initialized and will not work
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